Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
It takes approximately 12 hours for food to entirely digest.
93
You can't tickle yourself.
29
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The average sperm cell swims at 8 inches per hour.
4
The human sigh acts as a physiological reset button.
23
By weight, Bone is five times stronger than steel.
417
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346